Position: Home > Articles > Study on Surface Energy Balance Closure of a Coniferous Forest Plantation in Red Earth Hilly Area, China——Take Qianyanzhou, Taihe County, Jiangxi Province as an example
Scientia Silvae Sinicae
2006,42
(2)
13-20
红壤丘陵区人工林能量平衡闭合研究——以江西省泰和县千烟洲为例
作 者：
刘允芬;于贵瑞;李菊;宋霞;陈永瑞
单 位：
中国农业大学资源与环境学院;中国科学院地理科学与资源研究所
关键词：
涡度协方差技术;能量平衡闭合;可利用能量;湍流通量
摘 要：
运用线性回归、能量平衡闭合率和能量不平衡标准差等方法对湍流通量与可利用能量的关系进行分析。对红壤丘陵区千烟洲实验站人工林2003年能量平衡闭合进行的分析研究表明:本站可利用能量年累计值2798.28MJ·m-2,湍流通量累计值2332.70MJ·m-2。能量平衡闭合率的年值为65%;各月值为52%～76%,1月最低,6月最高;按季节看是夏季最高,冬季最低;1天内是白天高,夜间低,晴天白天可达80%以上。湍流脉动对能量闭合有明显影响,在摩擦速度低于0.4m·s-1时能量闭合随摩擦速度升高而增大。能量不闭合的原因主要是涡度相关仪器与辐射表测定的源面积之间的差异导致的采样误差,以及忽略了水平对流产生的影响。
译 名：
Study on Surface Energy Balance Closure of a Coniferous Forest Plantation in Red Earth Hilly Area, China——Take Qianyanzhou, Taihe County, Jiangxi Province as an example
作 者：
Liu Yunfen1 Yu Guirui1 Li Ju2 Song Xia1 Chen Yongrui1 (1.Institute of Geographic Sciences and Natural Resources Research, CAS Beijing 100101; 2.College of Resources and Environmental Sciences, China Agricultural University Beijing 100094)
关键词：
eddy_covariance technique; energy balance closure; available energy; turbulent energy
摘 要：
Eddy covariance (EC) technique has become a standard method to measure the carbon, water vapor and energy flux in the heterogeneous area, and the energy balance closure (EBC) is an important mean to test the reliability of EC technique. At the same time the EBC is an important content in the flux research. To evaluate the EBC, the methods of linear regression, the energy balance ratio (EBR) and the energy imbalance standard deviation were adopted in this paper. In this study site the sum of available energy and turbulent energy in a whole year were 2 798.28 and 2 332.70 MJ·m -2, respectively. In the whole year, the EBR was 65%, and the values of each month were 52%～76%, the minimum was appeared in January, and maximum in June. Generally, the EBR in summer was better than that in winter, and in daytime, which could reach 80%, it was better than that in nighttime. For the EBR varied with the friction velocity, it concluded that there had a significant relationship between the turbulent fluctuation and EBR. The energy closure increased with friction velocity increased when the latter was less than 0.4 m·s -1. In many case studies the ratio of EBR is always less than 1, it indicate that the turbulent energy is underestimated and the available energy is adverse, from this point, it may educe that the CO_2 flux is underestimate under the weak turbulent condition and low photosynthesis activate radiation condition. The main reasons which resulted in the imbalance of EBC were the advection ignored and the difference of footprint between turbulent energy measurement and available energy measurement.
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